非合作水声脉冲信号的单水听器匹配场定位研究

Matched Field Localization for Non-cooperative Underwater Acoustic Pulse Signals Using a Single Hydrophone

该文以非合作水声脉冲信号为对象,研究非合作条件下水声信号的单水听器匹配场定位。首先根据水声脉冲信号的短时瞬态非平稳特性,设计具有自适应径向高斯核函数的时频分布进行频率估计。然后利用声场传播模型计算声场,求解海洋信道脉冲响应。由计算出的信道脉冲响应和水听器上的接收信号,使用时域最小二乘的方法得到搜索网格区域上的拷贝场信号。最后通过建立误差代价函数,获得表征目标位置的模糊表面,实现利用单个水听器对非合作水声脉冲信号的匹配场定位。通过仿真实验和实际海试数据的验证,证明了该方法的有效性。

The single hydrophone matched field localization for non-cooperative underwater acoustic pulse signals is studied. The frequency of underwater acoustic pulse signals is firstly estimated by means of designing the time-frequency distribution with adaptive radially-gaussian kernel according to the characteristic of nonstationary and short duration transient of underwater acoustic pulse signals. And then the ocean channel impulse can be calculated from an acoustic propagation model. Using the received signal of single hydrophone and the ocean channel pulse response, the replica signal for every grid location over search region can be estimated employing the least squares solution in the time domain. Finally, matched field localization of using single hydrophone for non-cooperative underwater acoustic pulse signals is realized by comparing the difference between the received signal and the replica signal yielding the ambiguity surface of localizer function. Simulation and sea-experiment results demonstrate the effectiveness of the proposed method.